d15b ~$500, in stock, 130 hp, fun, depends on build
d16z6 ~$350, junkyard/TR, 125 hp, same, same
d16y8 ~$400, junkyard/TR, 128 hp, a little easier, same
all can be very slow in your car or very fast, it is up to you...bserieskllr(sp?) has a z6 in his crx hf w/boltons...low 14's. chi-town brat is a one cammer also. dun know her times/setup but i believe it is/was a y8. there's a few more on here, i just know them from the d-series forum.
old ref. site
http://hybrid2.honda-perf.org/
you'd almost be better off buying the d15b from hmotors. their engines are usually CLEAN and *haven't* been abused. any SOHC VTEC around here...i would put my money on it having a history almost as rough as it's idle.
Also think about the tranny...yours sucks. The Si is optimum for your year car. I have a spare laying around as well as a spare ZC transmission with int. shaft and brand new axles.